Trying to run git with shelly

Main.hs

{-# LANGUAGE OverloadedStrings #-}

import Shelly
import Data.Text as T
default (T.Text)

main = shelly $ do
         git "pull" []
         last_commit <- git "log" ["--oneline", "-n 1"]
         echo $ append "Last commit in this repo was: " last_commit
    where
      git cmd params = run "git" (cmd : params)

shelly-try.cabal

name:                shelly-try
version:             0.1.0.0
build-type:          Simple
cabal-version:       >=1.10

executable shelly-try
  main-is:             Main.hs
  build-depends:       base >=4.6 && <4.7,
                       text,
                       shelly
  default-language:    Haskell2010